OVMF ResetVector: Modify interface with SEC module

Previously it was:
  ESI/RSI - SEC Core entry point
  EDI/RDI - PEI Core entry point
  EBP/RBP - Start of BFV

Now it is:
  RAX/EAX  Initial value of the EAX register
           (BIST: Built-in Self Test)
  DI       'BP': boot-strap processor, or
           'AP': application processor
  RBP/EBP  Address of Boot Firmware Volume (BFV)

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9571 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/ResetVector/Ia32/SearchForSecEntry.asm

@@ -0,0 +1,196 @@
+;------------------------------------------------------------------------------
+; @file
+; Search for the SEC Core entry point
+;
+; Copyright (c) 2008 - 2009, Intel Corporation
+; All rights reserved. This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+BITS    32
+
+%define EFI_FV_FILETYPE_SECURITY_CORE         0x03
+
+;
+; Modified:  EAX, EBX, ECX, EDX
+; Preserved: EDI, EBP, ESP
+;
+; @param[in]   EBP  Address of Boot Firmware Volume (BFV)
+; @param[out]  ESI  SEC Core Entry Point Address
+;
+Flat32SearchForSecEntryPoint:
+
+    ;
+    ; Initialize EBP and ESI to 0
+    ;
+    xor     ebx, ebx
+    mov     esi, ebx
+
+    ;
+    ; Pass over the BFV header
+    ;
+    mov     eax, ebp
+    mov     bx, [ebp + 0x30]
+    add     eax, ebx
+    jc      secEntryPointWasNotFound
+
+    jmp     searchingForFfsFileHeaderLoop
+
+moveForwardWhileSearchingForFfsFileHeaderLoop:
+    ;
+    ; Make forward progress in the search
+    ;
+    inc     eax
+    jc      secEntryPointWasNotFound
+
+searchingForFfsFileHeaderLoop:
+    test    eax, eax
+    jz      secEntryPointWasNotFound
+
+    ;
+    ; Ensure 8 byte alignment
+    ;
+    add     eax, 7
+    jc      secEntryPointWasNotFound
+    and     al, 0xf8
+
+    ;
+    ; Look to see if there is an FFS file at eax
+    ;
+    mov     bl, [eax + 0x17]
+    test    bl, 0x20
+    jz      moveForwardWhileSearchingForFfsFileHeaderLoop
+    mov     ecx, [eax + 0x14]
+    and     ecx, 0x00ffffff
+    or      ecx, ecx
+    jz      moveForwardWhileSearchingForFfsFileHeaderLoop
+    add     ecx, eax
+    jz      jumpSinceWeFoundTheLastFfsFile
+    jc      moveForwardWhileSearchingForFfsFileHeaderLoop
+jumpSinceWeFoundTheLastFfsFile:
+
+    ;
+    ; There seems to be a valid file at eax
+    ;
+    cmp     byte [eax + 0x12], EFI_FV_FILETYPE_SECURITY_CORE ; Check File Type
+    jne     readyToTryFfsFileAtEcx
+
+fileTypeIsSecCore:
+    OneTimeCall GetEntryPointOfFfsFile
+    test    eax, eax
+    jnz     doneSeachingForSecEntryPoint
+
+readyToTryFfsFileAtEcx:
+    ;
+    ; Try the next FFS file at ECX
+    ;
+    mov     eax, ecx
+    jmp     searchingForFfsFileHeaderLoop
+
+secEntryPointWasNotFound:
+    xor     eax, eax
+
+doneSeachingForSecEntryPoint:
+    mov     esi, eax
+
+    test    esi, esi
+    jnz     secCoreEntryPointWasFound
+
+secCoreEntryPointWasNotFound:
+    ;
+    ; Hang if the SEC entry point was not found
+    ;
+    debugShowPostCode POSTCODE_SEC_NOT_FOUND
+    jz      $
+
+secCoreEntryPointWasFound:
+    debugShowPostCode POSTCODE_SEC_FOUND
+
+    OneTimeCallRet Flat32SearchForSecEntryPoint
+
+%define EFI_SECTION_PE32                  0x10
+
+;
+; Input:
+;   EAX - Start of FFS file
+;   ECX - End of FFS file
+;
+; Output:
+;   EAX - Entry point of PE32 (or 0 if not found)
+;
+; Modified:
+;   EBX
+;
+GetEntryPointOfFfsFile:
+    test    eax, eax
+    jz      getEntryPointOfFfsFileErrorReturn
+    add     eax, 0x18       ; EAX = Start of section
+
+getEntryPointOfFfsFileLoopForSections:
+    cmp     eax, ecx
+    jae     getEntryPointOfFfsFileErrorReturn
+
+    cmp     byte [eax + 3], EFI_SECTION_PE32
+    je      getEntryPointOfFfsFileFoundPe32Section
+
+    ;
+    ; The section type was not PE32, so move to next section
+    ;
+    mov     ebx, dword [eax]
+    and     ebx, 0x00ffffff
+    add     eax, ebx
+    jc      getEntryPointOfFfsFileErrorReturn
+
+    ;
+    ; Ensure that FFS section is 32-bit aligned
+    ;
+    add     eax, 3
+    jc      getEntryPointOfFfsFileErrorReturn
+    and     al, 0xfc
+    jmp     getEntryPointOfFfsFileLoopForSections
+
+getEntryPointOfFfsFileFoundPe32Section:
+    add     eax, 4       ; EAX = Start of PE32 image
+
+    mov     ebx, eax
+    cmp     word [eax], 'MZ'
+    jne     thereIsNotAnMzSignature
+    movzx   ebx, word [eax + 0x3c]
+    add     ebx, eax
+thereIsNotAnMzSignature:
+
+    ; if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE)
+    cmp     word [ebx], 'VZ'
+    jne     thereIsNoVzSignature
+    ; *EntryPoint = (VOID *)((UINTN)Pe32Data +
+    ;   (UINTN)(Hdr.Te->AddressOfEntryPoint & 0x0ffffffff) +
+    ;   sizeof(EFI_TE_IMAGE_HEADER) - Hdr.Te->StrippedSize);
+    add     eax, [ebx + 0x8]
+    add     eax, 0x28
+    movzx   ebx, word [ebx + 0x6]
+    sub     eax, ebx
+    jmp     getEntryPointOfFfsFileReturn
+
+thereIsNoVzSignature:
+
+    ; if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE)
+    cmp     dword [ebx], `PE\x00\x00`
+    jne     getEntryPointOfFfsFileErrorReturn
+
+    ; *EntryPoint = (VOID *)((UINTN)Pe32Data +
+    ;   (UINTN)(Hdr.Pe32->OptionalHeader.AddressOfEntryPoint & 0x0ffffffff));
+    add     eax, [ebx + 0x4 + 0x14 + 0x10]
+    jmp     getEntryPointOfFfsFileReturn
+
+getEntryPointOfFfsFileErrorReturn:
+    mov     eax, 0
+
+getEntryPointOfFfsFileReturn:
+    OneTimeCallRet GetEntryPointOfFfsFile
+